Step stool



FIG. 1 is a perspective view of a step stool showing a first embodiment of my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof, with the left-side elevational view thereof being substantially similar;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view of a step stool showing a second embodiment in accordance with my new design;

FIG. 8 is a front elevational view thereof;

FIG. 9 is a top plan view thereof;

FIG. 10 is a rear elevational view thereof;

FIG. 11 is a right-side elevational view thereof, with the left-side elevational view thereof being substantially similar;

FIG. 12 is a bottom view thereof;

FIG. 13 is a perspective view of a step stool showing a third embodiment of my new design;

FIG. 14 is a front elevational view thereof;

FIG. 15 is a top plan view thereof;

FIG. 16 is a rear elevational view thereof;

FIG. 17 is a right-side elevational view thereof, with the left-side elevational view thereof being substantially similar; and,

FIG. 18 is a bottom view thereof. 

The ornamental design for a step stool, as shown and described. 